Secondary metabolite

Secondary Metabolites are organic compounds that are not directly involved in the normal growth, development, or reproduction of an organism. Unlike primary metabolites, secondary metabolites often have a specific function in the plant or animal, such as defense against predators or pathogens, or communication with other organisms. They are often synthesized in response to specific environmental conditions or developmental stages.

Classification

Secondary metabolites can be classified into three main groups based on their biosynthetic origin: terpenes, phenolics, and nitrogen-containing compounds.

Terpenes

Terpenes are the largest group of secondary metabolites, consisting of over 40,000 known compounds. They are synthesized from five-carbon isoprene units and can range in size from monoterpenes (two isoprene units) to polyprenols (over 100 isoprene units).

Phenolics

Phenolics are compounds that contain one or more hydroxyl groups attached to an aromatic ring. They are synthesized from the amino acid phenylalanine and include a wide variety of compounds such as flavonoids, tannins, and lignins.

Nitrogen-containing compounds

Nitrogen-containing compounds include alkaloids, non-protein amino acids, and cyanogenic glycosides. They are synthesized from amino acids and often have potent biological activities.

Functions

Secondary metabolites have a wide range of functions in the organisms that produce them. Some common functions include:

• Defense against predators or pathogens
• Attraction of pollinators or seed dispersers
• Communication with other organisms
• Protection against UV radiation
• Regulation of plant growth and development

See also

• Primary metabolite
• Metabolism
• Biochemistry

References

Secondary metabolite Resources
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